Two weeks ago I went to the Museum aan de Stroom, which is located near the port area, in Antwerp. I didn't visit the museum itself, as I just went to the top floor to get the panorama view of the city. Though I have heard the museum is good, not expensive (5€ for the permanent exhibition) and you have plenty of floors (10!) full of artwork to explore. Nevertheless, if you want to do like myself, you just have to go up through the automatic stairs until the last floor and admire the view (it's for free). You can get a magnificent view of the cathedral and the old town buildings!